Nothing performs better on varmints than Federal's V-Shok ammunition. Sizzling velocity and explosive disruption make it the ultimate choice for your favorite varmint. V-Shok is available in your favorite prairie doggin' calibers and features the best bullets available for any varmint. V-Shok along for the hunt-you'll be glad you did. Varmint hunters require two things from a bullet: tight groups and quick expansion. The Speer TNT HP gives you both. For rapid expansion, TNT jackets are fluted more than 90% of their length and have a dead-soft core.